In the latest episode of Photo Evidence, host Catherine Barnwell examines years of satellite imagery showing Iran’s Taleghan 2 military facility, a site suspected of being linked to the Islamic Republic’s nuclear weapons programme.
Taleghan 2 is located within the sprawling Parchin military complex, roughly 20 miles southeast of Tehran. The wider site has come under repeated attack since 2024.
The facility was constructed in the early 2000s as part of Iran’s secretive Amad Plan, an alleged effort to develop a nuclear warhead. Tehran has consistently denied that the programme existed.
Under the 2015 nuclear agreement negotiated during Barack Obama’s presidency, Iran accepted a ban on this type of weapons research. However, the deal has since unravelled, while satellite images captured from 2024 onward have shown a series of unusual changes at Taleghan 2.
Israel destroyed the building in October 2024. Iran then reconstructed it and covered the new bunker with concrete and earth, before Israel struck the site again in March 2026.
Barnwell traces the facility’s latest reconstruction and considers what Iran may be concealing inside the site.
In Photo Evidence, Catherine Barnwell examines years of satellite imagery from Iran’s Taleghan 2, a facility suspected of being linked to the Islamic Republic’s nuclear weapons programme
Taleghan 2 lies within the extensive Parchin military complex, about 20 miles southeast of Tehran, which has faced repeated attacks since 2024
Barnwell examines Iran’s renewed construction work at Taleghan 2 and considers what may be hidden inside the facility
‘Satellite imagery showed Iran beginning repair work at the site,’ she explained.
‘Iran put up a huge tarpaulin canopy over the entire damaged, buried structure, blocking aerial and satellite views of the work being carried out below.
‘The apparent purpose is to hide activity inside the site, including the possible return of new testing equipment to the facility.
‘One of the central questions is whether Iran is replacing the high-explosive containment vessel believed to have been destroyed in the March strikes.
‘When Israel’s Mossad seized Iran’s secret nuclear archive in 2018, the documents and photographs included material directly connected to Taleghan 2 in 2003.
‘Among the most important items recorded in the archive was a small cylindrical steel vessel installed inside Taleghan 2 to contain high-explosive experiments.
‘The equipment was used in what are known as cold tests. During these experiments, scientists use conventional explosives to compress uranium substitutes, enabling them to examine the mechanics of a nuclear implosion without creating a nuclear explosion.
‘It is the essential final stage in designing a working nuclear warhead.’
Barnwell’s findings raise serious questions not only about Iran’s current nuclear ambitions, but also about whether the country continued weapons-related research despite its commitments under the nuclear deal.
The same archive indicated that Iran had not genuinely abandoned the programme. Instead, its leaders ordered the work to be divided and concealed in 2003.
‘The files showed that Taleghan 2 was never completely abandoned after 2003, and that nuclear-explosive experiments continued under greater secrecy throughout the 2000s and 2010s,’ Barnwell said.
‘Most importantly, the archive revealed that Iran’s leadership ordered the programme to be split up rather than destroyed in mid-2003.
‘Sensitive research was quietly shifted into a covert network, with scientists dispersed among universities and front organisations. That allowed dual-use information produced at facilities such as Taleghan to continue advancing under the cover of academic research.
‘In the months before 2024, however, intelligence declassifications indicated that Iran had taken this expertise off the shelf, discreetly returning to the undeclared Taleghan 2 site to restart highly secretive explosive research.’
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